The Cuban government says 32 of its nationals were killed during the US operation to seize Venezuelan leader Nicolás Maduro.
It described the dead as members of its armed forces and intelligence agencies who were killed 'in combat actions', declaring two days of national mourning.
The armed forces added the Cubans 'fell, after fierce resistance, in direct combat against the attackers or as a result of bombardments of installations'
Cuba, a long-standing ally of Venezuela, has for years supplied Maduro with his personal security detail and has personnel throughout the Venezuelan military.
Cuban President Miguel Díaz-Canel said the country had been providing protection to Maduro and his wife 'at the request' of Venezuela.
US spies had been monitoring Maduro's movements for months before US forces struck, according to US General Dan Caine.
Gen Caine said that they had learned where the former leader moved, lived, travelled, ate, and worked.
The New York Times reported that the CIA had also recruited a 'Venezuelan source' who it says informed the Americans of Maduro's exact location.
Many of those killed are believed to have been part of Maduro's close security detail, who were with him at the time.
A total death toll is reported to be around 80, according to an unnamed Venezuelan official, although this has not been independently verified.
